RL78/L23

Features

32MHz Renesas RL78-S3 CPU core
512KB flash (dual bank) and 32KB SRAM
8KB data flash memory (100,000 program/erase (P/E) cycles)
44-pin to 100-pin package lineup with a wide variety of package options including LQFP, LFQFP, and HWQFN
Built-in LCD controller supporting 19 to 56 segment signal outputs and 4 to 8 common signal outputs
Capacitive sensing unit supports up to 36ch
Rich timer functions including 16-bit general purpose timers, 32-bit and 16-bit low-power inverter timers, 16-bit Timer RJ, 16-bit Timer KB, and RTC
12-bit A/D converter, 8-bit D/A converter, comparator, and temperature sensor
SCI (UART, Simple SPI, Simple I²C), SPI, and I²C bus

Find Other Products in RL78 Low-Power 8 & 16-Bit MCUs

RL78/L23 Ultra-Low Power LCD MCU with Dual-Bank Flash and Capacitive Touch for HMI

Description

The Renesas RL78/L23 microcontroller has an RL78-S3 CPU core and rich peripheral features to deliver a better design experience that allows high-level system design while reducing power consumption, system cost, and overall footprint through an extensive range of peripheral functions and low-power operation. RL78/L23 is designed to meet the dynamic requirements of human-machine interface (HMI) applications, featuring capabilities such as capacitive touch sensing and segment LCD control. Additionally, HMI application systems can stay up-to-date, since RL78/L23’s dual-bank flash memory enables continuous firmware updating without interrupting system operation. RL78/L23 also supports rich timer functions including 16-bit general-purpose timers, 32-bit and 16-bit low-power inverter timers, 16-bit Timer RJ, 16-bit Timer KB, and RTC. Timer KB can generate up to 3 channels of PWM signals suitable for controlling power supplies, lighting, and inductive heating (IH) control.

The EEMBC (Embedded Microprocessor Benchmark Consortium) benchmark “ULPMark-PP (ULPMark-Peripheral Profile)” has registered the new score of 215 (1.8V) and 126 (3.0V) as the world's highest score for a 16-bit LCD MCU (as of August 27, 2025). ULPMark-PP is an international benchmark for quantitatively evaluating the energy efficiency of peripheral functions integrated within microcontrollers.

Parameters

Attributes	Value
Program Memory (KB)	64, 128, 256, 512
Data Flash (KB)	8
RAM (KB)	16, 32
Carrier Type	Full Carton (Tray), Full Tray (Tray), Tape & Reel
Supply Voltage (V)	1.6 - 5.5
I/O Ports	40, 44, 48, 60, 76, 95
Temp. Range (°C)	Ta = -40 to +105
Operating Freq (Max) (MHz)	32
USB FS (host ch/device ch)	( 0 / 0 )
SCI or UART (ch)	5, 6, 7, 8
SPI (ch)	5, 6, 7, 8
I2C (#)	8, 9, 10
CAN (ch)	0
CAN-FD (ch)	0
Wireless	No
LIN (#)	1
16-Bit Timer (ch) (#)	9, 11
12-Bit A/D Converter (ch)	8, 9, 10, 13
10-Bit A/D Converter (ch)	0
24-Bit Sigma-Delta A/D Converter (ch)	0
12-Bit D/A Converter (ch)	0
10-Bit D/A Converter (ch) (#)	0
8-Bit D/A Converter (ch)	2
Capacitive Touch Sensing Unit (ch)	16, 18, 20, 25, 34, 36
Segment LCD Controller	Yes
Security & Encryption	Unique ID, TRNG

Package Options

Pkg. Type	Pkg. Dimensions (mm)	Lead Count (#)	Pitch (mm)
LFQFP	7 x 7 x 1.7	48	0.5
LFQFP	10 x 10 x 1.7	64	0.5
LFQFP	12 x 12 x 1.7	80	0.5
LFQFP	14 x 14 x 1.7	100	0.5
LQFP	10 x 10 x 1.6	44	0.8
LQFP	10 x 10 x 1.7	52	0.65
LQFP	12 x 12 x 1.7	64	0.65
LQFP	14 x 14 x 1.7	80	0.65
LQFP	14 x 20 x 1.6	100	0.65
QFN	7 x 7 x 0.8	48	0.5

Product Comparison

	RL78/L23	RL78/I1C	RL78/L12	RL78/L13
Operating Freq (Max) (MHz)	32	24, 32	24	24
Program Memory (KB)	128, 256, 512	64, 128, 256, 512	8, 16, 32	16, 32, 48, 64, 96, 128
RAM (KB)	16, 32	6, 8, 16, 32	1, 1.5	1, 2, 4, 6, 8
Data Flash (KB)	8	2	2	4
Lead Count (#)	52, 64, 80, 100	64, 80, 100	32, 44, 48, 52, 64	64, 80
Capacitive Touch Sensing Unit (ch)	20, 25, 34, 36	0	0	0
16-Bit Timer (ch) (#)	11	8, 10	8	9
Asynchronous General Purpose Timer / Interval Timer (ch)	11, 14	3	1	1

Application Block Diagrams

	Integrated Washer-Dryer System with PFC Integrated washer-dryer system with energy-efficient design, BLDC motor control, and IoT connectivity.
	Smart Touch Panel Smart touch panel with low-power MCU enables real-time air quality, temperature, and touch control.
	Air Fryer Toaster Oven with Digital Controls Smart air fryer design supports sensors and uses touch HMI to deliver fast, healthy, perfectly cooked meals.
	Toaster Kettle Grill with Digital Controls This system enables faster, precise cooking with intuitive touch controls and display.
	Corded Stand Blender with Digital Controls Smart blender system with an intuitive UI and efficient motor control powered by an integrated MCU.
	Induction Heating Rice Cooker Smart IH rice cooker with precise temperature control, compact MCU, and energy-efficient design.
	LoRaWAN Gas Meter LoRaWAN network enables automatic, efficient gas meter shutdown with low power and long-range benefits.
	Power System for Smart Power Meter with 4G Module Smart power meter system ensures always-on operation with efficient energy use.